Reduce utils.Cfg references (#7650)

* app.UpdateConfig method

* test fix

* another test fix

* the config override option as-was is just error prone, remove it for now

* derp

api/team.go

@@ -123,9 +123,9 @@ func inviteMembers(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	if utils.IsLicensed() && !app.SessionHasPermissionToTeam(c.Session, c.TeamId, model.PERMISSION_INVITE_USER) {
 		errorId := ""
-		if *utils.Cfg.TeamSettings.RestrictTeamInvite == model.PERMISSIONS_SYSTEM_ADMIN {
+		if *c.App.Config().TeamSettings.RestrictTeamInvite == model.PERMISSIONS_SYSTEM_ADMIN {
 			errorId = "api.team.invite_members.restricted_system_admin.app_error"
-		} else if *utils.Cfg.TeamSettings.RestrictTeamInvite == model.PERMISSIONS_TEAM_ADMIN {
+		} else if *c.App.Config().TeamSettings.RestrictTeamInvite == model.PERMISSIONS_TEAM_ADMIN {
 			errorId = "api.team.invite_members.restricted_team_admin.app_error"
 		}